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Bio exam 3
Terms in this set (30)
Which of the following is not correct for biologically relevant DNA molecules?
both above answers are correct
it tends to be right-handed
it is a double helix
The 3' end of DNA molecules will contain which chemical functional group?
a hydroxyl group
Which type of chemical bond is present between two nucleotides joined together in a polynucleotide chain?
none of the above
Which of the following correctly describes the orientation of the nitrogenous bases in DNA?
they project inward from the sugar-phosphate backbone
Which of the following nitrogenous bases can form two hydrogen bonds?
adenine and thymine
Which nitrogenous base is complementary to guanine nitrogenous bases in DNA?
Which of the following is true for nucleotides found in DNA?
they contain deoxyribose
Which of the following is a modification that occurs in eukaryotic mRNA?
all of the above are modification of eukaryotic mRNA
Which of the following is true for a codon in an mRNA?
all of the above are true for codons in mRNA
Which of the following is not true for the structure of DNA?
the two polynucleotide strands are arranged parallel to each other
An organism that consists of two dominant alleles is considered to be
A plant with a genotype of AaBb is crossed with another plant of genotype
aaBb. What is the expected phenotypic ratio of the offspring from this cross?
A person with a genotype that is heterozygous would contain which allele designation?
The probability of producing a normal child by a heterozygous female parent
who has an autosomal dominant disorder and an affected father is homozygous recessive for the disorder is
Which of the following is correct?
both above answers are true
phenotype is the physical appearance or trait you observe
genotype is the actual composition of alleles present in an organism
A woman heterozygous for a dominant autosome-linked trait marries a man also
heterozygous for the recessive autosome-linked trait.. What is the probability that one of their children will have the dominant trait?
How many different gametes would be produced from an individual with a
genotype of AaBbCcDD?
The physical trait that is observed in an individual is also known as the
A woman heterozygous for recessive sex-linked color blindness marries a man
with normal vision. What is the probability that any of their children will have the color blindness?
Which of the following statements is true?
Fathers pass on their sex-linked genes to only daughters
The condensation of chromosomes initiates or begins during
The duplication of centrosomes occurs during
The separation of all sister chromatids into different daughter cells occurs during
none of the above
The alignment of all sister chromatids along the cell equator occurs during
The period during which the chromosomes are not condensed and exist as chromatin is known as
A diploid cell contains a total of 10 pairs of homologous chromosomes. Based upon this information, what is the diploid number of this cell?
The diploid number of an organism is 14. Based upon this information, how many tetrads would be visible during prophase I of meiosis for a germ cell of this organism?
When in meiosis do the tetrads form?
When in meiosis does the separation of pairs of sister chromatids into individual
chromosomes normally occur?
An organism has somatic cells with a total of 20 pairs of homologous chromosomes in each
one. Based upon this information, how many individual chromosomes would be present in the gametes made by this organism?
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